1.1.5 Size & Mass of Atoms

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Which particles within an atom have a relative mass of 1?
Protons and neutrons.
Almost the whole mass of an atom is concentrated where?
The nucleus.
How is the size of an atom determined?
Atomic size is determined by the distance between the nucleus and the outermost electron shell.
Electrons have virtually no what?
Mass.
What does the atomic number tell you?
The number of protons in an atom.
What does the mass number tell you?
The total number of protons and neutrons in an atom's nucleus.
How do you work out how many neutrons are in an atom?
Mass number - atomic number.
What is the radius of an atom?
0.1 nanometres.
What are isotopes?
Isotopes are atoms of the same element that have different numbers of neutrons.

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1.1.5 Size & Mass of Atoms

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